Treble

From Old French treble, from Latin triplus.

Full definition of treble

(music) Pertaining to the highest singing voice or part in harmonized music; soprano.

1957, J. D. Salinger, "Zooey", in, 1961, :He put his cigar in his mouth, and, with his right hand, up in the treble keys, he began to play, in octaves, the melody of a song called "The Kinkajou," which, somewhat notably, had shifted into and ostensibly out of popularity before he was born.

(plural trebles)

(music) The highest singing voice (especially as for a boy) or part in musical composition.
(music) A person or instrument having a treble voice or pitch; a boy soprano.
Any high-pitched or shrill voice or sound.
A threefold quantity or number; something having three parts or having been tripled.
(darts) Any of the narrow areas enclosed by the two central circles on a dartboard, worth three times the usual value of the segment.
(sports) Three goals, victories, awards etc. in a given match or season.

2014, Jacob Steinberg, "Wigan shock Manchester City in FA Cup again to reach semi-finals", The Guardian, 9 March 2014:As for City, a domestic treble is off the cards and they must haul themselves off the floor quickly with the second leg of their last-16 Champions League tie against Barcelona on Wednesday.

(transitive) To multiply by three; to make into three parts, layers, or thrice the amount.
(intransitive) To become multiplied by three or increased threefold.
(intransitive) To make a shrill or high-pitched noise.
(transitive) To utter in a treble key; to whine.